public decimal result(string input)
{
input = correction(input);
input = toUnarMinus(input);
List<string> operators = new List<string>(standart_operators);
Stack<string> stack = new Stack<string>();
Queue<string> queue = new Queue<string>(ConvertToPostfixNotation(input));
string str = queue.Dequeue();
while (queue.Count >= 0)
{
if (!operators.Contains(str))
{
try
{
stack.Push(str);
str = queue.Dequeue();
}
catch
{
stack.Clear();
stack.Push("Unparsable");
break;
}
}
else
{
decimal summ = 0;
switch (str)
{
case "+":
{
try
{
decimal a = Convert.ToDecimal(stack.Pop());
decimal b = Convert.ToDecimal(stack.Pop());
summ = a + b;
break;
}
catch
{
return Convert.ToDecimal("asdasd");
break; }
}
case "-":
{
try
{
decimal a = Convert.ToDecimal(stack.Pop());
decimal b = Convert.ToDecimal(stack.Pop());
summ = b - a;
break;
}
catch
{
return Convert.ToDecimal("asdasd");
break; }
}
case "*":
{
try
{
decimal a = Convert.ToDecimal(stack.Pop());
decimal b = Convert.ToDecimal(stack.Pop());
summ = a * b;
break;
}
catch
{
return Convert.ToDecimal("asdasd");
break; }
}
case "/":
{
try
{
decimal a = Convert.ToDecimal(stack.Pop());
decimal b = Convert.ToDecimal(stack.Pop());
summ = b / a;
break;
}
catch {
return Convert.ToDecimal("asdasd");
break; }
}
case "^":
{
try
{
decimal a = Convert.ToDecimal(stack.Pop());
decimal b = Convert.ToDecimal(stack.Pop());
summ = Convert.ToDecimal(Math.Pow(Convert.ToDouble(b), Convert.ToDouble(a)));
break;
}
catch
{
return Convert.ToDecimal("asdasd");
break; }
}
case "@":
{
try
{
decimal a = Convert.ToDecimal(stack.Pop());
summ = -a;
break;
}
catch {
break;
}
}
}
stack.Push(summ.ToString());
if (queue.Count > 0)
str = queue.Dequeue();
else
break;
}
}
if (stack.ToArray().Length > 1)
{
string s = "sasdasd";
decimal b = Convert.ToDecimal(s);
return b;
}
else
{
return Convert.ToDecimal(stack.Pop());
}
}
private string startCalculating()
{
if (expression.Equals(Constant.VOID) || expression.Length <= 0)
{
return(Constant.VOID);
}
string[] tokens = letsGOTokenize(expression);
showArray(tokens, "tokens");
string token, previous = Constant.VOID;
foreach (string el in tokens)
{
token = el;
Console.WriteLine("\n");
showArray(numbers.ToArray(), "Numbers Before");
showArray(operations.ToArray(), "Operations Before");
// is Delimiter
if (isDelimiter(token))
{
switch (token)
{
case Constant.OPEN_BRACKET:
tryInsertNumericFactor(previous);
operations.Push(Constant.OPEN_BRACKET);
break;
case Constant.CLOSE_BRACKET:
while (operations.Count != 0 && !operations.Peek().Equals(Constant.OPEN_BRACKET))
{
calculate();
}
operations.Pop();
break;
}
}
// is Operation or Function
if (isOperation(token) || isFunction(token))
{
if (operations.Count == 0)
{
if (token.Equals(Constant.MINUS) && isUnaryMinus(previous))
{
token = Constant.UNARY_MINUS;
}
else if (isFunction(token) && !token.Equals(Constant.FACTORIAL))
{
tryInsertNumericFactor(previous);
}
}
else
{
// operations not empty
if (isFunction(token) && !token.Equals(Constant.FACTORIAL))
{
tryInsertNumericFactor(previous);
}
else if (token.Equals(Constant.MINUS) && isUnaryMinus(previous))
{
token = Constant.UNARY_MINUS;
}
if (!previous.Equals(Constant.EXPONENT) && !token.Equals(Constant.UNARY_MINUS))
{
while (operations.Count != 0 && getPriority(token) <= getPriority(operations.Peek()))
{
calculate();
}
}
}
operations.Push(token);
}
// is Number
if (isNumber(token))
{
tryInsertNumericFactor(previous);
if (token.Equals(Constant.PI))
{
token = String.Concat(Math.PI);
}
else if (token.Equals(Constant.E))
{
token = String.Concat(Math.E);
}
if (isContainsFunction(token))
{
int len = getFunctionLength(token);
String number = token.Substring(0, token.Length - len);
String function = token.Substring(token.Length - len);
numbers.Push(number);
while (operations.Count != 0 && getPriority(Constant.MULTIPLY) <= getPriority(operations.Peek()))
{
calculate();
}
operations.Push(Constant.MULTIPLY);
operations.Push(function);
token = function;
}
else
{
numbers.Push(token);
}
}
previous = token;
Console.WriteLine("\n");
showArray(numbers.ToArray(), "Numbers After");
showArray(operations.ToArray(), "Operations After");
}
while (operations.Count != 0)
{
calculate();
}
Console.WriteLine("\n");
showArray(numbers.ToArray(), "Numbers End");
showArray(operations.ToArray(), "Operations End");
return(numbers.Pop());
}